<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style>
			#dv1{
				background-color: lightgreen;
				overflow: auto;
			}
			#dv1 div{
				width: 200px;
				height: 200px;
				border: 1px solid red;
				background-color: pink;
				float: left;
			}
			button{				
				width: 100px;
				height: 50px;
			}
		</style>
	</head>
	<body>
		<div id="dv1">
			<div></div>
			<div></div>
			<div></div>
			<div></div>
			<div></div>
			<div></div>
		</div>
		<button type="button">ok1</button>
		<button type="button">ok2</button>
		<button type="button">ok3</button>
		<button type="button">ok4</button>
	</body>
</html>
